TY - JOUR
T1 - Physical Insight Into Hybrid-Synchronization-Controlled Grid-Forming Inverters Under Large Disturbances
AU - Liu, Teng
AU - Wang, Xiongfei
PY - 2022/10
Y1 - 2022/10
N2 - This letter analyzes the impact of hybrid voltage- and power-based synchronization control on the transient stability of grid-forming (GFM) inverters. It is found that the added voltage-based synchronization loop exploits the phase angle difference to resist frequency deviation, whose function is similar to the damper winding of synchronous generators. By resembling the large-signal model of such hybrid synchronization control (HSC) to the power-angle swing equation, it is proved that the HSC brings higher damping to the system and thus, enhances the transient stability of GFM inverters. Further, a comparative study of two active power controllers, i.e., the droop controller with a low-pass filter and the proportional-integral (PI) controller, is given. It is revealed that the HSC with the droop controller equivalently decreases the active power reference, which leads to better transient stability behavior than that of using the PI controller. The theoretical findings are corroborated by experimental tests.
AB - This letter analyzes the impact of hybrid voltage- and power-based synchronization control on the transient stability of grid-forming (GFM) inverters. It is found that the added voltage-based synchronization loop exploits the phase angle difference to resist frequency deviation, whose function is similar to the damper winding of synchronous generators. By resembling the large-signal model of such hybrid synchronization control (HSC) to the power-angle swing equation, it is proved that the HSC brings higher damping to the system and thus, enhances the transient stability of GFM inverters. Further, a comparative study of two active power controllers, i.e., the droop controller with a low-pass filter and the proportional-integral (PI) controller, is given. It is revealed that the HSC with the droop controller equivalently decreases the active power reference, which leads to better transient stability behavior than that of using the PI controller. The theoretical findings are corroborated by experimental tests.
KW - Inverters
KW - Phase locked loops
KW - Power system stability
KW - Stability criteria
KW - Synchronization
KW - Transient analysis
KW - Transient stability
KW - Windings
KW - grid-forming inverters
KW - hybrid synchronization controller
KW - Grid-forming (GFM) inverters
KW - transient stability
UR - http://www.scopus.com/inward/record.url?scp=85128605780&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2022.3168902
DO - 10.1109/TPEL.2022.3168902
M3 - Journal article
SN - 0885-8993
VL - 37
SP - 11475
EP - 11480
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 10
ER -